Slack is a real-time messaging, archiving, and search tool for modern teams. Slack brings all your communication together in one place.
Everything is perfectly in sync as you move between your desktop, iPhone, iPad, or Android device. Powerful search & archiving means you can forget when you need to: Slack willl remember for you.
Create open channels for the projects, groups and topics that the whole team shares. Channels increase transparency by putting knowledge in everyone’s hands. Discoverability, complete history & search across all channels is built in. Channels include messages, files & comments, inline images & video, rich link summaries and integration with the services you use every day, like Twitter, Dropbox & Google Drive.
Slack is free to use for as long as you want and with an unlimited number of people.